实现滑动到底部时上拉加载更多的功能的listview
来源:互联网 发布:主力净买入指标源码 编辑:程序博客网 时间:2024/05/21 07:06
先看效果图:
[java] view plain copy print?
- /**
- * 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能.
- */
- public class RefreshLayout extends SwipeRefreshLayout implements
- OnScrollListener {
- /**
- * 滑动到最下面时的上拉操作
- */
- private int mTouchSlop;
- /**
- * listview实例
- */
- private ListView mListView;
- /**
- * 上拉监听器, 到了最底部的上拉加载操作
- */
- private OnLoadListener mOnLoadListener;
- /**
- * ListView的加载中footer
- */
- private View mListViewFooter;
- /**
- * 按下时的y坐标
- */
- private int mYDown;
- /**
- * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉
- */
- private int mLastY;
- /**
- * 是否在加载中 ( 上拉加载更多 )
- */
- private boolean isLoading = false;
- /**
- * @param context
- */
- public RefreshLayout(Context context) {
- this(context, null);
- }
- @SuppressLint("InflateParams")
- public RefreshLayout(Context context, AttributeSet attrs) {
- super(context, attrs);
- mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
- mListViewFooter = LayoutInflater.from(context).inflate(
- R.layout.listview_footer, null, false);
- }
- @Override
- protected void onLayout(boolean changed, int left, int top, int right,
- int bottom) {
- super.onLayout(changed, left, top, right, bottom);
- // 初始化ListView对象
- if (mListView == null) {
- getListView();
- }
- }
- /**
- * 获取ListView对象
- */
- private void getListView() {
- int childs = getChildCount();
- if (childs > 0) {
- View childView = getChildAt(0);
- if (childView instanceof ListView) {
- mListView = (ListView) childView;
- // 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载
- mListView.setOnScrollListener(this);
- Log.d(VIEW_LOG_TAG, "### 找到listview");
- }
- }
- }
- /*
- * (non-Javadoc)
- *
- * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
- */
- @Override
- public boolean dispatchTouchEvent(MotionEvent event) {
- final int action = event.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- // 按下
- mYDown = (int) event.getRawY();
- break;
- case MotionEvent.ACTION_MOVE:
- // 移动
- mLastY = (int) event.getRawY();
- break;
- case MotionEvent.ACTION_UP:
- // 抬起
- if (canLoad()) {
- loadData();
- }
- break;
- default:
- break;
- }
- return super.dispatchTouchEvent(event);
- }
- /**
- * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.
- *
- * @return
- */
- private boolean canLoad() {
- return isBottom() && !isLoading && isPullUp();
- }
- /**
- * 判断是否到了最底部
- */
- private boolean isBottom() {
- if (mListView != null && mListView.getAdapter() != null) {
- return mListView.getLastVisiblePosition() == (mListView
- .getAdapter().getCount() - 1);
- }
- return false;
- }
- /**
- * 是否是上拉操作
- *
- * @return
- */
- private boolean isPullUp() {
- return (mYDown - mLastY) >= mTouchSlop;
- }
- /**
- * 如果到了最底部,而且是上拉操作.那么执行onLoad方法
- */
- private void loadData() {
- if (mOnLoadListener != null) {
- // 设置状态
- setLoading(true);
- //
- mOnLoadListener.onLoad();
- }
- }
- /**
- * @param loading
- */
- public void setLoading(boolean loading) {
- isLoading = loading;
- if (isLoading) {
- mListView.addFooterView(mListViewFooter);
- } else {
- mListView.removeFooterView(mListViewFooter);
- mYDown = 0;
- mLastY = 0;
- }
- }
- /**
- * @param loadListener
- */
- public void setOnLoadListener(OnLoadListener loadListener) {
- mOnLoadListener = loadListener;
- }
- @Override
- public void onScrollStateChanged(AbsListView view, int scrollState) {
- }
- @Override
- public void onScroll(AbsListView view, int firstVisibleItem,
- int visibleItemCount, int totalItemCount) {
- // 滚动时到了最底部也可以加载更多
- if (canLoad()) {
- loadData();
- }
- }
- /**
- * 设置刷新
- */
- public static void setRefreshing(SwipeRefreshLayout refreshLayout,
- boolean refreshing, boolean notify) {
- Class<? extends SwipeRefreshLayout> refreshLayoutClass = refreshLayout
- .getClass();
- if (refreshLayoutClass != null) {
- try {
- Method setRefreshing = refreshLayoutClass.getDeclaredMethod(
- "setRefreshing", boolean.class, boolean.class);
- setRefreshing.setAccessible(true);
- setRefreshing.invoke(refreshLayout, refreshing, notify);
- } catch (NoSuchMethodException e) {
- e.printStackTrace();
- } catch (IllegalAccessException e) {
- e.printStackTrace();
- } catch (InvocationTargetException e) {
- e.printStackTrace();
- }
- }
- }
- /**
- * 加载更多的监听器
- */
- public static interface OnLoadListener {
- public void onLoad();
- }
- }
自定义适配器
[java] view plain copy print?
- public class MyAdapter extends BaseAdapter {
- public ArrayList<HashMap<String, String>> list;
- public Context context;
- public LayoutInflater layoutInflater;
- public MyAdapter(Context context, ArrayList<HashMap<String, String>> list) {
- this.context = context;
- this.list = list;
- layoutInflater = LayoutInflater.from(context);
- }
- @Override
- public int getCount() {
- return list.size();
- }
- @Override
- public Object getItem(int position) {
- return null;
- }
- @Override
- public long getItemId(int position) {
- return 0;
- }
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- View view = null;
- ViewHolder holder = null;
- if (convertView == null) {
- view = layoutInflater.inflate(R.layout.item, null);
- holder = new ViewHolder();
- holder.txt =(TextView) view.findViewById(R.id.textView1);
- view.setTag(holder);
- } else {
- view = convertView;
- holder = (ViewHolder) view.getTag();
- }
- holder.txt.setText(list.get(position).get("itemText"));
- return view;
- }
- static class ViewHolder {
- TextView txt;
- }
- }
新建一个Activity展示
[java] view plain copy print?
- public class MainActivity extends Activity implements OnRefreshListener,
- OnLoadListener {
- private RefreshLayout swipeLayout;
- private ListView listView;
- private MyAdapter adapter;
- private ArrayList<HashMap<String, String>> list;
- private View header;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- initView();
- setData();
- setListener();
- /*设置自动刷新 swipeLayout.setRefreshing(true);
- 在 setRefreshing(true)并没有触发onRefresh的,须要手动调用一次
- */
- // swipeLayout.post(new Thread(new Runnable() {
- // @Override
- // public void run() {
- // swipeLayout.setRefreshing(true);
- // }
- // }));
- // onRefresh();
- }
- /**
- * 初始化布局
- */
- @SuppressLint({ "InlinedApi", "InflateParams" })
- private void initView() {
- header = getLayoutInflater().inflate(R.layout.header, null);
- swipeLayout = (RefreshLayout) findViewById(R.id.swipe_container);
- swipeLayout.setColorSchemeResources(R.color.color_bule2,R.color.color_bule,R.color.color_bule2,R.color.color_bule3);
- }
- /**
- * 添加数据
- */
- private void setData() {
- list = new ArrayList<HashMap<String, String>>();
- for (int i = 0; i < 10; i++) {
- HashMap<String, String> map = new HashMap<String, String>();
- map.put("itemImage", i+"默认");
- map.put("itemText", i+"默认");
- list.add(map);
- }
- listView = (ListView) findViewById(R.id.list);
- listView.addHeaderView(header);
- adapter = new MyAdapter(this, list);
- listView.setAdapter(adapter);
- }
- /**
- * 设置监听
- */
- private void setListener() {
- swipeLayout.setOnRefreshListener(this);
- swipeLayout.setOnLoadListener(this);
- }
- /**
- * 上拉刷新
- */
- @Override
- public void onRefresh() {
- swipeLayout.postDelayed(new Runnable() {
- @Override
- public void run() {
- // 更新数据 更新完后调用该方法结束刷新
- list.clear();
- for (int i = 0; i < 8; i++) {
- HashMap<String, String> map = new HashMap<String, String>();
- map.put("itemImage", i+"刷新");
- map.put("itemText", i+"刷新");
- list.add(map);
- }
- adapter.notifyDataSetChanged();
- swipeLayout.setRefreshing(false);
- }
- }, 2000);
- }
- /**
- * 加载更多
- */
- @Override
- public void onLoad() {
- swipeLayout.postDelayed(new Runnable() {
- @Override
- public void run() {
- // 更新数据 更新完后调用该方法结束刷新
- swipeLayout.setLoading(false);
- for (int i = 1; i < 10; i++) {
- HashMap<String, String> map = new HashMap<String, String>();
- map.put("itemImage", i+"更多");
- map.put("itemText", i+"更多");
- list.add(map);
- }
- adapter.notifyDataSetChanged();
- }
- }, 2000);
- }
0 0
- 实现滑动到底部时上拉加载更多的功能的listview
- 自定义上拉加载下拉刷新控件,从而实现滑动到底部时上拉加载更多的功能
- DropDownListView下拉刷新及滑动到底部加载更多ListView
- listview实现滑动到底部加载
- XRecyclerView:实现下拉刷新、滚动到底部加载更多以及添加header功能的RecyclerView
- scrollview 实现滑动到底部再滑动加载数据的功能
- scrollview 实现滑动到底部再滑动加载数据的功能
- scrollview 实现滑动到底部再滑动加载数据的功能
- scrollview 实现滑动到底部再滑动加载数据的功能
- scrollview 实现滑动到底部再滑动加载数据的功能
- listview底部加载更多的操作
- scrollview 实现滑动到底部加载更多数据
- Android实现下拉刷新,滑动加载更多的功能
- js滑动到底部加载更多
- ListView滚动到底部自动加载更多
- ListView滚动到底部自动加载更多
- jquery实现滑动到底部加载下一页的数据
- ListView滑动到底部的监听
- Java实现生产者与消费者
- Native English
- 【年中总结】不忘初心,持续向前
- 浙大PAT甲级 1076
- Java 关键字final、static
- 实现滑动到底部时上拉加载更多的功能的listview
- pca matlab
- size_t和ssize_t
- 删除被其他表关联的主表
- java 正则表达式
- easyui tree拖动事件
- 写给matlab新手的几句话[转]
- lua 5.2 的 _ENV
- xtrabackup热备一致性原理